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Micro Distribution of the Payara Project for IBM JDK
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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2011-2012 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
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 *
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 */
package org.glassfish.admin.amx.impl.config;

import org.glassfish.admin.amx.config.AMXConfigProxy;
import org.glassfish.external.arc.Stability;
import org.glassfish.external.arc.Taxonomy;
import org.jvnet.hk2.config.TranslationException;
import org.jvnet.hk2.config.VariableResolver;

/**
 * Helper to resolve attribute configuration values eg
 * ${com.sun.aas.installRoot} once they have already been obtained in "raw"
 * form. If the goal is to fetch the attribute values in already-resolved form,
 * do so directly via
 *
 * @{link AttributeResolver#resolveAttribute}.  Values can be resolved into
 * String, boolean or int. 
 Example usage:
 * 
 * HTTPListenerConfig l = ...; // or any AMXConfigProxy sub-interface
 * AttributeResolverHelper h = new AttributeResolverHelper( l );
 * int port = h.resolveInt( l.getPort() );
 * 
 Alternately, the static method form can be used:

 *  * HTTPListenerConfig l = ...; // or any AMXConfigProxy sub-interface
 * int port = AttributeResolverHelper.resolveInt( l, value );
 * 
 */
@Taxonomy( stability = Stability.UNCOMMITTED)
public class AttributeResolverHelper extends VariableResolver {

    private static void debug(final String s) {
        System.out.println("##### " + s);
    }

    public AttributeResolverHelper(final AMXConfigProxy amx) {
    }

    @Override
    protected String getVariableValue(final String varName) throws TranslationException {
        String result = varName;

        // first look for a system property
        final Object value = System.getProperty(varName);
        if (value != null) {
            result = "" + value;
        }
        // Removed code that walked hierarchy since this is not called.
        return result;
    }

    /**
     * Return true if the string is a template string of the for ${...}
     */
    public static boolean needsResolving(final String value) {
        return value != null && value.indexOf("${") >= 0;
    }

    /**
     * Resolve the String using the target resolver (MBean).
     */
    public String resolve(final String in) throws TranslationException {
        final String result = translate(in);

        //debug( "AttributeResolverHelper.resolve(): " + in + " ===> " + result );

        return result;
    }
}